docs: def colgen(*lstcol,**kargs):
      """Returns a generator that mixes provided quantities forever
      trans: a function to convert the three arguments into a color. lambda x,y,z:(x,y,z) by default"""
      if len(lstcol) < 2:
          lstcol *= 2
      trans = kargs.get("trans", lambda x,y,z: (x,y,z))
      while 1:
          for i in range(len(lstcol)):
              for j in range(len(lstcol)):
                  for k in range(len(lstcol)):
                      if i != j or j != k or k != i:
                          yield trans(lstcol[(i+j)%len(lstcol)],lstcol[(j+k)%len(lstcol)],lstcol[(k+i)%len(lstcol)])